I agree with all that has been said so far about focusing on those things that will improve the basic operation of the car. Suspension, electrical, etc are all candidates and you should be able to figure out the priority once you get the vehicle and have some time with it. A quick comment on the rear brake upgrade that you are considering. I just competed a 4 wheel upgrade using the Arizona Z kit. It is very high quality and even though I thought the OEM brakes were more than sufficient, the stopping power I have now is definitely a cut above OEM. Probably was not a necessity for me as most of my driving is street oriented (albeit spirited at that), but I do like having the improved braking capability. However, this upgrade was not without its challenges. First, if you go with the discs on the rear, you will likely lose the hand brake capability that you have now. This is somewhat dependent on the setup that you use, but for sure the Arizona Z kit does away with the OEM hand brake setup. However Dave from Arizona Z does sell a nicely designed "mechanical" caliper and also provides the brackets to mount it, but the installation of the cable and other hardware necessary to make it work will essentially be up to you. I ended up having to design some custom brackets for an aftermarket Lokar universal hand brake cable and it was a very elegant design in the end, but I had to figure this all out myself. On top of that, you will also need to change your proportioning valve so as to get the correct bias between front and rear. The stock valve is attached to the firewall near the booster, but it is fixed. You will need to either replace the OEM one or augment it with an adjustable one. The Arizona Z kit does come with a nice Wilwood valve but it is big and bulky and you have to find a place to mount it as well. I ended up going a different route with a much smaller valve but it required the fabrication of a few brake lines and some other bracket design work. Should you decide to go this route in the future, I'd be happy to post some pictures and provide more details on exactly what I did to make this work, but it is not as simple as just bolting on a set of calipers in the rear, and "you're done". Hope that helps. Mike.